Coupling



(NO'ModeL) 0. 1:. MARK;

COUPLING.

No. 296,027. Patented Apr. ,1, 1884..

N. PETERS. Phmwlihogrzphlr. Wnlhlnghn. D. O.

UNITED STATES PATENT OFFICE.

CHARLIE EDGAR MARK, OF FLINT, MICHIGAN, ASSIGN OR ONE-HALF TO JOSIAH W. BIGOLE, DAVID S. FOX, AND GEORGE L. WALKER, ALL OF SAME PLACE.

COUPLING.

SPECIFICATION forming part of Letters Patent No. 296,027, dated April 1, 1884.

Application filed February 2, 1884. (No model.)

To all whom itmay concern:

Be it known that I, CHARLIE E. MARK, of Flint, in the county of Genessee and State of Michigan, have invented new and useful Im- 5 provements in Couplings, and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to certain new and useful improvements in the manufacture of couplings for rods that are at times to be submitted to a torsional strain. I

The invention consists in so forming such I5 coupling that its bore will be D-shaped, so as to prevent turning upon the rod to which it is secured, while its exterior will be circular, and provided with perforatedears, by means of which it may be secured to an adjacent rod, coupling, or lever.

Figure 1 is a perspective view of my improved coupling. Fig. 2 is a horizontal crosssection. v I

In the accompanying drawings, which form a part of this specification, there is shown a cylindricalshaped coupling, made of gas-pipe, which has been cut to a proper length, heated and subjected to a suitable pressure upon its ends by any of the known powers, until that may be subjected.

portion of the metal between the ears A is 30 forced into the body of the coupling, or, as it is sometimes called, upset. This is donein such a manner by placing the section of gas pipe upon a D-shaped mandrel, so that while the cylindrical outward form is retained the bore has been compelled under the pressure to assume in cross-section the D shape of the mandrel by forcing the iron displaced from between the ears into the flattened side of the bore. After this has been done, the coupling is removed from the mandrel and the cars perforated by drilling or punching.

It will readily be seen that in this coupling no iron is cut out and wasted by being so cut out to form the ears, and that a strong coupling is obtained at a very small expense, and which will turn on the rod to which it is secured under any torsional strain to which. it

What I claim as my invention is- A coupling made of gas-pipe, outwardly cylindrical in form and provided with ears, while its bore is D-shaped in cross-section, substantially as described.

I CHARLIE E. MARK.

Witnesses:

H. S. SPRAGUE,

E. ScULLY. 

